Just bought a vacuum gauge and put it on my engine to check my idle. The engine was warmed up and sitting at about 150*. I used one of the smaller ports going to the AC I beleive (I dont have a vacuum distribution block since the engine is in a truck. I switched the 5.0 manifolds stalk out with my truck stalk giving me the branchs I needed). Should I have read the vaccum off a larger outlet? Maybe the PCV or Brakebooster stalk? I used the AC since it was the simplest.
Anyway, It was reading at 14hg at warm idle around 1100 RPM. I idle a little high but havent got my Tach in yet (going in tonight) so the actual RPM is only a vague guess. I'm not real sure what it should be but that seemed a little low to me. Also, I was told that if I had a vac leak I could see some fluctuation in the reading.. How much would be typical? The vac gauge was a little shaky at 14. Moving between about 14 1/2 and 13 1/2. I wasnt sure if that was just natural vibration or something. the guage is a cheap 20$ Advaned Auto Parts affair and having never used one I dont know if a small amount of needle shake is normal or indicitive of a leak.
Engine mods (if it matters much) - .40 over, KB Pistons, ported e7's.
Anyway, It was reading at 14hg at warm idle around 1100 RPM. I idle a little high but havent got my Tach in yet (going in tonight) so the actual RPM is only a vague guess. I'm not real sure what it should be but that seemed a little low to me. Also, I was told that if I had a vac leak I could see some fluctuation in the reading.. How much would be typical? The vac gauge was a little shaky at 14. Moving between about 14 1/2 and 13 1/2. I wasnt sure if that was just natural vibration or something. the guage is a cheap 20$ Advaned Auto Parts affair and having never used one I dont know if a small amount of needle shake is normal or indicitive of a leak.
Engine mods (if it matters much) - .40 over, KB Pistons, ported e7's.